This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A319595 #13 Mar 20 2020 20:15:41 %S A319595 0,1,2,4,8,40,100,164,328,400,8200,14762,532900 %N A319595 Numbers in base 10 that are palindromic in bases 3, 7, and 9. %C A319595 Intersection of A014190, A029954, and A029955. %C A319595 No other terms < 10^17. It is likely that there are no more terms. - _Chai Wah Wu_, Mar 20 2020 %e A319595 400 = 112211_3 = 1111_7 = 484_9. %o A319595 (Sage) %o A319595 [n for n in (0..100000) if Word(n.digits(3)).is_palindrome() and Word(n.digits(7)).is_palindrome() and Word(n.digits(9)).is_palindrome()] %Y A319595 Cf. A014190 (base 3), A029954 (base 7), and A029955 (base 9). %K A319595 nonn,base,more %O A319595 1,3 %A A319595 _Jeremias M. Gomes_, Sep 23 2018